import sys
input=sys.stdin.readline
def I(): return int(input())
def MI(): return map(int, input().split())
def LI(): return list(map(int, input().split()))
mod=10**9+7

def main():
    N,X=MI()
    A=[0]*N
    B=[0]*N
    
    from collections import defaultdict
    ddA = defaultdict(int)
    ddB = defaultdict(int)
    
    for i in range(N):
        A[i]=I()
        ddA[A[i]]+=1
        B[i]=A[i]^X
        ddB[B[i]]+=1
        
    ans=0
    for k,v in ddA.items():
        ans+=v*ddB[k]
        
    print(ans//2)


main()